groupdel: Parse and handle long options

completions/groupdel

@@ -1,5 +1,27 @@
 # groupdel(8) completion                                   -*- shell-script -*-
 
-complete -g groupdel
+_groupdel()
+{
+    local cur prev words cword
+    _init_completion || return
+
+    case $prev in
+        -h|--help)
+            return
+            ;;
+        -R|--root)
+            _filedir -d
+            return
+            ;;
+    esac
+
+    if [[ "$cur" == -* ]]; then
+        COMPREPLY=( $( compgen -W '$( _parse_help "$1" )' -- "$cur" ) )
+        return
+    fi
+
+    COMPREPLY=( $( compgen -g -- "$cur" ) )
+} &&
+complete -F _groupdel groupdel
 
 # ex: filetype=sh